\begin{pspicture}(0,-.5)(7,7)
	\input{fig/1d-helpers.tex}
	% Lassos.
	\pspolygon*[linecolor=lightgray,fillcolor=lightgray]
						 (4,2.45)(4.55,3)(2,5.55)(1.45,5)
	\pspolygon[linecolor=black,linestyle=dashed]
						 (4.45,2)(5,1.45)(5.55,2)(5,2.55)
	\pspolygon*[linecolor=lightgray,fillcolor=lightgray]
						 (5,3.45)(5.55,4)(3,6.55)(2.45,6)
	\pspolygon[linecolor=black,linestyle=dashed]
						 (5.45,3)(6,2.45)(6.55,3)(6,3.55)
	% Arrows and dots.
	\Eright14\Hup23\Hright23\Eup32\Eright32\Hup41
	\Hright25\Eleft34\Eup34\Eright34\Hleft43\Hup43\Hright43\Eleft52\Eup52
	\Hleft45\Eleft54\Hleft63
  % Axes.
  \Taxis016\Xaxis160
\end{pspicture}
